Self-Lowering Oven Door Cart for Ergonomic High-Capacity Loading
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Solution Overview
Problem
Conventional oven door assembly carts limit the number of doors that can be carried due to ergonomic design constraints, requiring operators to lift or lower doors outside a safe height range, which reduces efficiency and increases operational costs.
Innovation Solution
A self-elevating and self-lowering assembly cart that automatically adjusts the loading and unloading height of oven doors to within a predetermined ergonomic work zone without requiring a power source, allowing for maximum door capacity and flexibility across various door weights and models.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the cart is designed to carry seven or eight doors stacked vertically, then the structural capacity is maximized, but the operator must load/unload doors from heights outside the ergonomic work zone (less than 30 inches or greater than 60 inches from the floor)
Solution Approach 1:
The cart employs adjustable shelving positions that allow the vertical arrangement of doors to be dynamically reconfigured. The shelves can be moved to different heights to accommodate varying numbers of doors (six, seven, or eight) while keeping the top door within the ergonomic work zone (30-60 inches from floor), resolving the contradiction between carrying capacity and operational ease.
2Ease of operation
If the cart is constrained to keep all doors within the ergonomic work zone (30-60 inches from floor), then ease of operation is improved, but the number of doors that can be carried is reduced below the structural capacity
Solution Approach 1:
The adjustable shelving mechanism enables dynamic reconfiguration of door positions vertically. When carrying six doors, all shelves are positioned within the ergonomic zone. When carrying seven or eight doors, the lower shelves are positioned below the ergonomic zone while the top door remains accessible, optimizing both capacity and operational ease according to actual needs.
3Reliability
If the cart is designed for a specific door weight range, then it performs optimally for that weight, but it lacks flexibility when door weights vary across different appliance models
Solution Approach 1:
The cart features adjustable shelving positions that can be reconfigured to accommodate different door weights and sizes. By changing the vertical positions of the shelves, the cart adapts to various door specifications across different appliance models, maintaining performance reliability while increasing versatility.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The cart enhances manufacturing efficiency by enabling operators to load and unload doors within a safe height range, reducing operational costs and extending the cart's lifespan through adaptable use with different appliance components.
Implementation Method 1
The means for automatically self-elevating and self-lowering can include a coil spring
Implementation Method 2
The means for automatically self-elevating and self-lowering can include a gas cylinder or adjustable gas cylinder
Data Source
AI summary
An unpowered, self-elevating and self-lowering home appliance assembly cart for supporting and transporting a plurality of home appliance assembly components, such as oven doors, including a base, and a self-leveling and self-lowering door suspension and supporting system having a mast, a rail system moveably coupled to the mast, a plurality of arms extending from the rail system, each pair of arms for supporting a home appliance assembly component, and a self-leveling and self-lowering device that automatically self-levels and self-lowers the pair of arms within a predetermined acceptable ergonomic work zone with respect to a vertical height along the mast based on an unloaded state, a partially loaded state, and a loaded state of the plurality of arms and without power assistance, the predetermined acceptable ergonomic work zone being for loading and unloading the home appliance assembly component from the pair of arms.